Description
4-Pyridoxic acid is an endogenous substrate of renal organic anion transporters (OAT1/3) and a catabolite of vitamin B6. 4-Pyridoxic acid is excreted through OAT1/3-mediated tubular active secretion, which can reflect OAT1/3 activity. Elevated plasma concentrations of 4-Pyridoxic acid are associated with decreased OAT1/3 activity in chronic kidney disease (CKD) and can be used as a biomarker to reflect the severity of knee osteoarthritis (KOA) and lumbar spondylosis (LS)[1][2][3][4]